Python 排列组合的计算

1. 调用 scipy 计算排列组合的具体数值

A23=6,(32)=3

>> from scipy.special import comb, perm>> perm(3, 2)6.0>> comb(3, 2)3.0
1
2
3
4
5
1
2
3
4
5

2. 调用 itertools 获取排列组合的全部情况数

>> from itertools import combinations, permutations>> permutations([1, 2, 3], 2)<itertools.permutations at 0x7febfd880fc0>                # 可迭代对象>> list(permutations([1, 2, 3], 2))[(1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)]>> list(combinations([1, 2, 3], 2))[(1, 2), (1, 3), (2, 3)]